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annotate src/share/vm/gc_implementation/g1/concurrentG1Refine.hpp @ 11979:8d4ff57af591

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8022051: G1: Remove some unused G1 flags Reviewed-by: tschatzl, jmasa
author brutisso
date Thu, 01 Aug 2013 17:29:49 +0200
parents e72f7eecc96d
children 8847586c9037
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1 /*
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2 * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP
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27
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28 #include "gc_implementation/g1/g1HotCardCache.hpp"
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29 #include "memory/allocation.hpp"
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30 #include "runtime/thread.hpp"
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31 #include "utilities/globalDefinitions.hpp"
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32
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33 // Forward decl
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34 class ConcurrentG1RefineThread;
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35 class G1CollectedHeap;
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36 class G1HotCardCache;
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37 class G1RemSet;
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38 class DirtyCardQueue;
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39
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40 class ConcurrentG1Refine: public CHeapObj<mtGC> {
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41 ConcurrentG1RefineThread** _threads;
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42 int _n_threads;
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43 int _n_worker_threads;
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44 /*
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45 * The value of the update buffer queue length falls into one of 3 zones:
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46 * green, yellow, red. If the value is in [0, green) nothing is
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47 * done, the buffers are left unprocessed to enable the caching effect of the
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48 * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement
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49 * threads are gradually activated. In [yellow, red) all threads are
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50 * running. If the length becomes red (max queue length) the mutators start
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51 * processing the buffers.
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52 *
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53 * There are some interesting cases (when G1UseAdaptiveConcRefinement
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54 * is turned off):
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55 * 1) green = yellow = red = 0. In this case the mutator will process all
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56 * buffers. Except for those that are created by the deferred updates
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57 * machinery during a collection.
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58 * 2) green = 0. Means no caching. Can be a good way to minimize the
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59 * amount of time spent updating rsets during a collection.
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60 */
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61 int _green_zone;
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62 int _yellow_zone;
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63 int _red_zone;
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64
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65 int _thread_threshold_step;
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66
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67 // We delay the refinement of 'hot' cards using the hot card cache.
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68 G1HotCardCache _hot_card_cache;
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69
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70 // Reset the threshold step value based of the current zone boundaries.
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71 void reset_threshold_step();
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72
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73 public:
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74 ConcurrentG1Refine(G1CollectedHeap* g1h);
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75 ~ConcurrentG1Refine();
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76
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77 void init(); // Accomplish some initialization that has to wait.
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78 void stop();
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79
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80 void reinitialize_threads();
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81
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82 // Iterate over all concurrent refinement threads
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83 void threads_do(ThreadClosure *tc);
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84
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85 // Iterate over all worker refinement threads
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86 void worker_threads_do(ThreadClosure * tc);
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87
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88 // The RS sampling thread
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89 ConcurrentG1RefineThread * sampling_thread() const;
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91 static int thread_num();
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93 void print_worker_threads_on(outputStream* st) const;
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94
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95 void set_green_zone(int x) { _green_zone = x; }
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96 void set_yellow_zone(int x) { _yellow_zone = x; }
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97 void set_red_zone(int x) { _red_zone = x; }
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98
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99 int green_zone() const { return _green_zone; }
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100 int yellow_zone() const { return _yellow_zone; }
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101 int red_zone() const { return _red_zone; }
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102
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103 int total_thread_num() const { return _n_threads; }
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104 int worker_thread_num() const { return _n_worker_threads; }
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105
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106 int thread_threshold_step() const { return _thread_threshold_step; }
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107
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108 G1HotCardCache* hot_card_cache() { return &_hot_card_cache; }
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109 };
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110
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111 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP